Curriculum
Course: IB Physics SL
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Curriculum

IB Physics SL

Theme A — Space, Time and Motion

0/80 Dr Dabour Hub Science Diagram and Course Material

Theme B — The Particulate Nature of Matter

0/87 Dr Dabour Hub Science Diagram and Course Material

Theme C — Wave Behaviour

0/60 Dr Dabour Hub Science Diagram and Course Material

Theme D — Fields

0/41 Dr Dabour Hub Science Diagram and Course Material

Theme E — Nuclear and Quantum Physics

0/59 Dr Dabour Hub Science Diagram and Course Material

Tools and Inquiry — IB Physics skills

0/54 Dr Dabour Hub Science Diagram and Course Material
Quiz

B.3.6 Derivation of the Kinetic Theory of Gases Equation – Check yourself

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  • Questions count: 6
  • Passing grade: B+
  • Time limit: 10 minutes
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1.
In the derivation, the time between successive collisions of a molecule with the same wall is
L/vx
vx/2L
2L/vx
L/2vx
2.
The factor ⅓ in p = ⅓ρ⟨c2⟩ arises because
collisions are inelastic
pressure acts on one third of the walls
molecules spend a third of the time moving
there are three dimensions and the motion is random
3.
The impulse on the wall in one elastic collision of a molecule of mass m and x-velocity vx is
2mvx
mvx
0
mvx2
4.
A gas of 2.0 × 1023 molecules each of mass 6.0 × 10−26 kg, ⟨c2⟩ = 2.5 × 105 m2 s−2 is in 0.010 m3. The pressure is
3.0 × 105 Pa
1.0 × 105 Pa
1.0 × 106 Pa
3.0 × 104 Pa
5.
The product Nm/V in the derivation equals the
pressure
density of the gas
number density
molar mass
6.
Which assumption allows us to ignore collisions between molecules in the derivation?
Molecules are heavy
They never happen
They are elastic and the molecules are identical, so total momentum components are unchanged
The container is a cube
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Part of Theme B — The Particulate Nature of Matter — see every lesson and quiz in this unit.
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